To be eligible for a B.Sc. (Bachelor of Science) degree at St. Stephen's College Kollam, candidates must fulfill certain criteria. Firstly, applicants must have completed their higher secondary education (10+2) or its equivalent from a recognized board or university. Secondly, they should have studied Science subjects (Physics, Chemistry, and Biology/Mathematics) in their 10+2 curriculum. Additionally, candidates must meet the minimum required percentage in their qualifying examination, which may vary from year to year based on the college's admission policy. It is also important to note that meeting the eligibility criteria does not guarantee admission, as the selection process may involve entrance exams or interviews.